Electric transformer



(No Mddel!) L. GUTMANN. ELECTRIC TRANSFORMER No. 577,480. I Patented Feb. 23, 1897.

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UNITED STATES PATENT OFFICE.

LUDIVIG GUTMANN, OF PEORIA, ILLINOIS.

ELECTRIC TRANSFORMER.

SPECIFICATION forming part of Letters Patent No. 577,480, dated February 23, 1897.

Application filed April 25, 1896. Serial No. 589,045. (No model.)

To aZZ whom it may concern.-

Be it known that I, LUDwIe GUTMANN, a citizen of the United States, and a resident of the city of Peoria, county of Peoria, and State of Illinois, have invented new and useful I1nprovements in Electric Transformers, (Case No. 85,) of which the following is a specification.

This electric transformer or energy-transforming device belongs to that class of apparatus adapted to operate by alternating, pulsating, or intermittent electric currents for raising, lowering, or adjusting the pressure and current derived from a source.

The invention consists in particular in the design of an element-plate economical to build and economical to operate.

The invention is explained with reference to the accompanying drawings, in which Figure 1 shows the complete element-plate Fig. 2, a cross-section through a transformer; Figs. 3 and 4, modifications over Fig. 1; and Fig. 5 is a modification over Fig. 2, showing position of clamping-bolts and end plates.

Referring in particular to Fig. 1, it represents the element-plate A of an electric transformer, choke-coil, or economy-coil and c011- sists of three, pieces, two angular pieces B, which in this case form a closed rectangle, and a magnetic bridge or cross piece 0, which is securely held in the recess E, provided in the angle-pieces by the projections D D of the bridge-piece O. This latter piece forms the core proper and establishes a double magnetic path around the coil or coils which energizes it through the abutting angle-pieces. The projections D D may be of different pitch or dimensions, so that a set of plates once assembled is held in position by the succeeding one. In this figure the pieces B are not provided with means for interlocking independently from the piece 0, the border-lines L being shown straight, but no displacement can take place if the core is properly clamped together, owing to the projections D D.

Fig. 2 represents a section of a transformer, with primary coil F and secondary coil G occupying the internal free space around corepieces 0. Without departing from the nature of the invention the projections D D may be given any form or position desired. To illustrate this, they have been shown slightly displaced in this figure.

Fig. 3 shows a modification of the B plates, each of which is provided with a projection D at one end and a recess at the other to be able to interlock them. Neither on piece 0 or 13 is a projection provided to interlock with one another, because the main object to be shown in this figure is the interlocking of the pieces B. These laminze are each provided with a lug II, which are diagonally opposite one another. hen the plates are arranged so as to break joints, it is evident that lugs for receivin g the clamping-bolts will be located at all four corners, as indicated by the dotted lines. The projections D are shown slightly to one side of the middle of the width of the 13 piece.

In Fig. at, which is provided with four lugs II instead of two, the projections D are located more centrally. In this figure but a single interlocking-lug D has been provided for on the center core 0, which may be made to have any desired dimensions and configuration. It is shown almost as wide as plate 0. The plates are assembled so as to break joints, as indicated by dotted lines.

Fig. 5 shows a cross-section through a trans former, of which the top half is removed. In this figure it will be seen that the primary coil F and secondary coil G surround the core G, whose projecting lugs extend for a short distance into the B pieces, these projections having such dimensions as to be slightly larger than one-half of the width of plate 0, so that each layer holds rigidly together the elemental pieces of the plate below. The lugs D D, which interlock the two angle pieces, are shown here of semicircular shape. Below the core-plates we see the clamping-plate or frame K, with the bolts I located in the lugs II.

hat I claim as my invention is 1. In an electric ironclad transformer the combination of the laminated iron envelop, having its laminae made each of three punchings of magnetic material, two of them fitting together from opposite sides of the coils, and a center plate entering within the coils and interlocking with the two punchings first named at points out of coincidence, and with successive laminae reversed, as and for the purpose described.

2. An electric transformer the laminated core of which is built up of laminae, made each of three sheets or punchings of magnetic material, two of them fitting together from opposite sides of the coils of the transformer, and the third or core plate proper entering within the coil or coils adapted to interlock with the punchings named first, of unequal length on opposite sides of the axial plane of the coils and with superposed layers reversed, as and for the purpose described.

3. In an element-plate for electric transformers, the combination of two equal punchin gs having limbs of unequal length, recesses provided in one of said limbs, and a third punching placed at right angles to the longer limbs, projections forming the extreme ends of said third punching adapted to be retained in the recesses above named, as and for the purpose described.

4. An element-plate for electric transformers, or similar devices consisting of the combination of two punehings, each having two limbs at an angle to one another, and a recess in one or both of them, and a third plate or punching adapted to be retained in two oppositely-located recesses of the two punchings named first, as and for the purpose described.

5. In an electric transformencore the combination of two punehings, each having limbs at an angle to one another, and both punchings forming together a symmetrical figure, recesses located in oppositely-located limbs of said punehings, and a third stamping adapted to be retained between the others having proj ections located u nsymmetrically with respect to the axis of said third punching.

6. In an electric transformer the combination, with the transformer-coils of a laminated core built up of lamina), made each of a central plate projecting out of the coils an unequal distance on opposite sides of the 'axial plane of the coils, a pair of angleshaped punehings, and a recess in one arm of said punching for retaining the projection of the plate first named, and with successive laminae reversed to break joints.

In testimony that I claim the foregoing as my invention I have sign ed my name, in presence of two witnesses, this 23d day of April, 1896.

LUDlVIG GUTMANN.

'Witnesses:

G. G. LU'rHY, DAVID Ross. 

